From c2b0cec2ea8892a78c6e51f1d6a717797d78ccfd Mon Sep 17 00:00:00 2001
From: Chris Forbes <chrisf@ijw.co.nz>
Date: Mon, 28 Feb 2011 22:18:44 +1300
Subject: [PATCH] add a sensible error when trying to save a map using a bogus
 tileset

---
 OpenRA.Game/Map.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/OpenRA.Game/Map.cs b/OpenRA.Game/Map.cs
index cf29e55ffb..6892a782dc 100644
--- a/OpenRA.Game/Map.cs
+++ b/OpenRA.Game/Map.cs
@@ -375,7 +375,12 @@ namespace OpenRA
 				// File header consists of a version byte, followed by 2 ushorts for width and height
 				writer.Write(TileFormat);
 				writer.Write((ushort)MapSize.X);
-				writer.Write((ushort)MapSize.Y);
+				writer.Write((ushort)MapSize.Y);
+
+				if (!OpenRA.Rules.TileSets.ContainsKey(Tileset))
+					throw new InvalidOperationException(
+						"Tileset used by the map ({0}) does not exist in this mod. Valid tilesets are: {1}"
+						.F(Tileset, string.Join(",", OpenRA.Rules.TileSets.Keys.ToArray())));
 
 				// Tile data
 				for (int i = 0; i < MapSize.X; i++)